NEW YORK (AP) – The US government’s first glance at the actual use of COVID-19 vaccines has shown that their effectiveness is almost as strong as in controlled studies.
The two vaccines available from December, Pfizer և Moderna, were 90% more effective after two doses, the Centers for Disease Control and Prevention said Monday. In trials, the vaccines were approximately 95% effective in preventing COVID-19.
“This is very encouraging news,” said Mark Thompson, lead author of the CDC study. “We have a vaccine that works very well.”
The study is the government’s first assessment of how the shooting works beyond the pharmacists’ initial experience. Outcomes can sometimes change when vaccines are used in a larger, more diverse population outside of research.
With nearly 4,000 participants from six states, the study focused on health care workers, first responders, and other frontline workers who were primarily prioritized for the shots because they were at higher risk. They were given test kits for nasal swabs to use every week to check for signs of coronavirus infection.
“The (currently available) COVID-19 vaccine evidence base is already strong and continues to grow with such studies,” said David Holtgrave, dean of the University of Albany School of Public Health, in an e-mail.
The study included about 2,500 volunteers who completed two doses of the vaccine, about 500 who received one dose, and about 1,000 who were not vaccinated between mid-December and mid-March.
The researchers counted 205 infections, 161 of which were in the unvaccinated group. Of the remaining 44, the CDC says 33 of them were people who apparently became infected within two weeks of the shooting. Experts say it takes two weeks for the dose to work fully.
No one died, only two were hospitalized. Thompson did not say whether the hospitalized people had been vaccinated.
In addition to the 90% dose of the two doses, the study found that it was 80% effective for participants two weeks or more after the first dose.
CDC Director Dr. Rochelle Valensky called the results of the study “extremely encouraging”.
“Our national vaccination efforts are working,” he told a White House news conference on Monday. He added that more than 93 million Americans have received at least one dose of the vaccine, and more than 51 million people have been fully vaccinated.
Various researchers have tried to study how the vaccines were administered in real life, including the work done in Israel, the United Kingdom, and the Mayo Clinic in the United States.
In contrast to Mayo’s study, which focused on hospitalization and death, the CDC study looked for any infection, including infections that never caused symptoms or were found before people became ill.
About two-thirds of the vaccines were shot by Pfizer, one-third by Moderna, and five people received the latest single shot of Johnson & Johnson. The study was conducted in Miami; Duluth, Minnesota; Portland, Oregon; Temple, Texas; Salt Lake City; o Phoenix այլ Other areas of Arizona.
Meanwhile, Moderna announced on Monday that it had delivered its 100 millionth dose to the US government, fulfilling its promise to deliver by the end of March. The company said it expects to meet its next deadline by the end of May, when it will reach 100 million shares, and the final 100 million by the end of July.
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